<!DOCTYPE html>
<html lang="zh">
  <head>
    <meta charset="UTF-8" />
    <title>实现一辆自行车</title>
    <style>
      body {
        margin: 0px;
      }
      .container {
        position: relative;
        max-width: 1000px;
        width: 100%;
        margin: 0px auto;
        display: flex;
        align-items: center;
        justify-content: center;
        min-height: 100vh;
      }
      .cycle_container {
        position: relative;
        width: 500px;
        height: 400px;
        display: flex;
        align-items: flex-end;
        justify-content: space-between;
      }
      .tier {
        position: relative;
        width: 200px;
        height: 200px;
        border: 20px solid #0f0f6a;
        border-radius: 50%;
        box-sizing: border-box;
        display: flex;
        align-items: center;
        justify-content: center;
      }
      .tier::after,
      .tier::before {
        position: absolute;
        content: '';
        border-radius: 50%;
        box-sizing: border-box;
      }
      .tier:after {
        height: 100%;
        width: 100%;
        border: 10px solid #ddd;
      }
      .tier::before {
        height: 40px;
        width: 40px;
        background: #0f0f6a;
        z-index: -1;
      }
      .pedle_round {
        position: absolute;
        height: 40px;
        width: 40px;
        background: #0f0f6a;
        border-radius: 50%;
        box-sizing: border-box;
        top: 74%;
        left: 42%;
      }
      .pedle_round::after {
        position: absolute;
        content: '';
        height: 140px;
        width: 12px;
        background: #ddd;
        border-radius: 20px;
        transform: rotate(278deg);
        top: -140%;
        right: 193%;
        z-index: -1;
      }
      .pedle_round::before {
        position: absolute;
        content: '';
        height: 123px;
        width: 4px;
        background: #0f0f6a;
        transform: rotate(278deg);
        top: -98%;
        right: 205%;
      }
      .seat {
        position: absolute;
        width: 70px;
        height: 20px;
        background: #0f0f6a;
        border-radius: 12px;
        top: 35%;
        left: 23%;
      }
      .seat::after {
        position: absolute;
        content: '';
        width: 48px;
        height: 16px;
        border-radius: 12px;
        background: #0f0f6a;
        top: -221%;
        left: 253%;
        transform: rotate(9deg);
      }
      .front_rod {
        position: absolute;
        width: 50px;
        height: 15px;
        background: #ddd;
        top: 28%;
        left: 58%;
        transform: rotate(329deg);
        z-index: -1;
        border-radius: 12px;
      }
      .front_rod::after,
      .front_rod::before {
        position: absolute;
        content: '';
        height: 203px;
        width: 12px;
        background: #ddd;
        border-radius: 20px;
        transform: rotate(0deg);
      }
      .front_rod::before {
        right: 368%;
        top: -56px;
      }
      .front_rod_outer {
        position: absolute;
        width: 24px;
        height: 3px;
        background: #0f0f6a;
        top: 37%;
        left: 58%;
        transform: rotate(56deg);
        /* z-index: -1; */
        border-radius: 12px;
      }
      .side_rod {
        position: absolute;
        width: 187px;
        height: 15px;
        background: #ddd;
        top: 54%;
        left: 35%;
        transform: rotate(295deg);
        z-index: -1;
        border-radius: 12px;
      }
      .side_rod::after {
        position: absolute;
        content: '';
        width: 262px;
        height: 15px;
        background: #ddd;
        top: -421%;
        left: -35%;
        transform: rotate(28deg);
        z-index: -1;
        border-radius: 12px;
      }
      .side_rod_outer {
        position: absolute;
        width: 48px;
        height: 4px;
        background: #0f0f6a;
        top: 46%;
        left: 51%;
        transform: rotate(295deg);
        z-index: -1;
        border-radius: 12px;
      }
      .side_rod_outer::after {
        position: absolute;
        content: '';
        width: 30px;
        height: 4px;
        background: #0f0f6a;
        top: -7px;
        left: 38%;
        transform: rotate(28deg);
        z-index: -1;
        border-radius: 12px;
      }
      .peddle {
        position: absolute;
        width: 55px;
        height: 15px;
        background: #0f0f6a;
        border-radius: 12px;
        top: 63%;
        left: 46%;
        transform: rotate(23deg);
      }
      .peddle::after {
        position: absolute;
        content: '';
        width: 55px;
        height: 15px;
        background: #0f0f6a;
        border-radius: 12px;
        top: 115px;
        left: -21px;
        transform: rotate(18deg);
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="cycle_container">
        <div class="tier"></div>
        <div class="tier"></div>
        <div class="pedle_round"></div>
        <div class="seat"></div>
        <div class="front_rod"></div>
        <div class="front_rod_outer"></div>
        <div class="side_rod"></div>
        <div class="side_rod_outer"></div>
        <div class="peddle"></div>
      </div>
    </div>
  </body>
</html>
